Android使用ViewPager完成app引导页

public class MainActivity extends AppCompatActivity {


//  int[] resourceId = {
//      R.layout.first,
//      R.layout.second,
//      R.layout.third
//  };
  List mListView;
  ViewPager viewPager;
  ViewGroup dotGroup;
  List dotImageView = new ArrayList<>();

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    viewPager = findViewById(R.id.main_vp);
    dotGroup = findViewById(R.id.dot_layout);

    mListView = new ArrayList<>();
    for (int index = 0; index <3; index++) {
      ImageView imageView = new ImageView(this);
      imageView.setImageResource(R.mipmap.ic_launcher_round);
      mListView.add(imageView);

      ImageView dot = new ImageView(this);
      dot.setImageResource(R.mipmap.cc_dot_o);
      dot.setMaxHeight(100);
      dot.setMaxWidth(100);

      LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(60, 60);
      layoutParams.leftMargin = 85;
      dot.setLayoutParams(layoutParams);
      dot.setEnabled(false);
      dotGroup.addView(dot);
      dotImageView.add(dot);
    }

    myAdapter adapter = new myAdapter();
    viewPager.setAdapter(adapter);
    viewPager.setCurrentItem(1);
    setDotWindow(1);

    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
      @Override
      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

      }

      @Override
      public void onPageSelected(int position) {
        //回调这个方法
        setDotWindow(position);
      }

      @Override
      public void onPageScrollStateChanged(int state) {

      }
    });

  }

  private void setDotWindow(int position) {
    for (int index = 0; index 

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